WMS service DPI setting inconsistent with the default used by MapGuide

Description

MapGuide uses a default screen resolution setting of 96 DPI. When the WMS service creates an MgMap object to render a requested map image, it sets the DPI value to 72. This results in incorrect scale calculations, which can result in the wrong layer style being used at a particular scale.

The WMS service should leave the DPI setting at its default value of 96.